Quantum Superposition and Reality: Realities Are Separate But Linked. Quantum physics teaches us that the realiyy we experience is but one wave out of a enormous number of wave possibilities. The wave possibilities is the quantum superposition which contains all the possibilities.
Consider a particle with energy E in the inner region of a one-dimensional potential well V(x). ..... In classical mechanics, if E < V (the maximum height of the potential barrier), the particle remains in the well forever; if E > V , the particle escapes. In quantum mechanics, the situation is not so simple. The particle can escape even if its energy E is below the height of the barrier V , although the probability of escape is small unless E is close to V .
Quantum Superposition by Yhrite. Elizabeth, Bioshock Infinite Burial At Sea. "The Luteces warned me that if I went back (to where I died) that I'd suffer the effects of quantum superposition." Ie. She would become mortal again if she returns to where she "died". But Elizabeth decides to do this anyways. Her sacrifice makes it possible for Jack to save the Little Sisters. The Luteces' fates are unknown: either they remained as Time-lords or became mortal again to live their lives.